ICON Vehicle Dynamics 2007-2021 Toyota Tundra Stage 1 RTX Rear Suspension System

The ICON Vehicle Dynamics Stage 1 RTX Suspension System is a complete rear suspension upgrade for 2007–2021 Toyota Tundra trucks, combining ICON RXT Multi-Rate Leaf Springs, RXT 2.5 Aluminum Series reservoir shocks, a hydraulic rear bump stop kit, and a Toyota rear U-bolt kit into one bolt-in package. The system delivers up to 20% more rear wheel travel than stock while retaining OEM wheel and tire fitment.

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Multi-Rate Leaf Springs Built for Variable Loads

The ICON RXT Multi-Rate Leaf Springs offer three user-adjustable spring rates, letting Tundra owners dial in rear suspension behavior whether the bed is empty, loaded with gear, or towing. Galvanized leaf separators reduce friction between leaves and resist corrosion over time, while leaf tip inserts cut the noise and harshness that worn OEM packs introduce. A military-wrap front eyelet adds durability at the most stress-concentrated point of the pack. The springs bolt directly into the OEM spring location, so no fabrication or frame modification is required.

Reservoir Shocks and Hydraulic Bump Stops That Work Together

The RXT 2.5 Aluminum Series rear shocks use a unique side-mounted lower eyelet that increases available travel while using the factory mounting location. Each shock carries a 10-inch aluminum reservoir that adds oil and nitrogen volume, keeping damping consistent as shock temperature rises during extended off-road use. The shocks are fully rebuildable and revalveable, so performance can be restored or retuned without replacing the unit.

The ICON Hydraulic Rear Bump Stop Kit provides 2.5 inches of travel and uses position-sensitive technology that exponentially increases bottom-out resistance as the suspension approaches full compression. The result is a progressive, controlled end-of-travel feel rather than an abrupt stop, which reduces rear-end kick on rough terrain and protects the chassis on hard hits.

ICON 1K Validated

Every component in the Stage 1 RTX system was developed and validated through ICON's "ICON 1K" accelerated R&D program, which ran over a year of testing across high-speed desert terrain and off-grid expedition use to confirm tune, strength, and durability before release.

Features

• Up to 20% more rear wheel travel over stock without sacrificing up-travel
• 3 user-adjustable spring rates on the RXT Multi-Rate Leaf Springs for varying load configurations
• 10-inch aluminum reservoirs on RXT 2.5 shocks for consistent damping as temperatures rise
• 2.5-inch hydraulic bump stop travel with position-sensitive bottom-out resistance
• Fully rebuildable and revalveable shocks for long-term serviceability
• Direct bolt-in to OEM locations, compatible with stock wheels and tires

Specifications

Who This Is For and Isn't

The Stage 1 RTX system suits 2007–2021 Toyota Tundra owners who want meaningfully more rear wheel travel and better load-handling capability, whether for high-speed desert running, loaded overland use, or daily driving with a frequently varying bed load. It fits with OEM wheels and tires.

This kit covers the rear suspension only and does not include any front suspension components. It is not compatible with the TRD rear sway bar kit and must not be combined with other aftermarket suspension kits (Application Note #17). No lift height is stated for this system.

Common Questions

Does this system include front suspension components?

The Stage 1 RTX Suspension System for the 2007–2021 Toyota Tundra is a rear-only kit. It includes the RXT Multi-Rate Leaf Springs, RXT 2.5 Aluminum Series rear shocks with reservoirs, the hydraulic rear bump stop kit, and a Toyota rear U-bolt kit. No front shocks, coilovers, or control arms are included.

What is included in the kit?

The Stage 1 RTX kit ships with two ICON RXT Multi-Rate Leaf Spring packs with add-in leaf (part 158509), one pair of ICON RXT Rear 2.5 VS reservoir shocks (part 57823P), one ICON Hydraulic Rear Bump Stop Kit (part 56108), and one Toyota Rear 8.0-inch U-Bolt Kit (part 52050). The system ships in multiple boxes.

Will this kit work with my stock wheels and tires?

Yes. The Stage 1 RTX Suspension System for the 2007–2021 Toyota Tundra is compatible with OEM wheels and tires. ICON also recommends specific ICON Alloys wheel sizes (17x8.5, 18x9, and 20x9 in stated offsets) and tires up to 35x12.50 inches; larger tires may require fender trimming.

Can the spring rate be adjusted after installation?

The ICON RXT Multi-Rate Leaf Springs offer three user-adjustable spring rates, allowing the rear suspension tune to be changed to suit different vehicle configurations (for example, a lightly loaded daily driver versus a heavily loaded expedition setup) without replacing the spring pack.

Are the shocks rebuildable?

The RXT 2.5 Aluminum Series rear shocks included in this Stage 1 RTX system are fully rebuildable and revalveable. This means damping performance can be restored or the tune adjusted over the life of the shock without purchasing a replacement unit.

Is this kit compatible with the TRD rear sway bar kit?

No. The Stage 1 RTX Suspension System is not compatible with the TRD rear sway bar kit. It is also a stand-alone system and must not be used in combination with any other aftermarket suspension kit, per ICON Application Note #17.